linux/usr/include/asm-generic/bitsperlong.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __ASM_GENERIC_BITS_PER_LONG
#define __ASM_GENERIC_BITS_PER_LONG

#ifndef __BITS_PER_LONG
/*
 * In order to keep safe and avoid regression, only unify uapi
 * bitsperlong.h for some archs which are using newer toolchains
 * that have the definitions of __CHAR_BIT__ and __SIZEOF_LONG__.
 * See the following link for more info:
 * https://lore.kernel.org/linux-arch/[email protected]/
 */
#if defined(__CHAR_BIT__) && defined(__SIZEOF_LONG__)
#define __BITS_PER_LONG …
#else
/*
 * There seems to be no way of detecting this automatically from user
 * space, so 64 bit architectures should override this in their
 * bitsperlong.h. In particular, an architecture that supports
 * both 32 and 64 bit user space must not rely on CONFIG_64BIT
 * to decide it, but rather check a compiler provided macro.
 */
#define __BITS_PER_LONG …
#endif
#endif

#ifndef __BITS_PER_LONG_LONG
#define __BITS_PER_LONG_LONG …
#endif

#endif /* __ASM_GENERIC_BITS_PER_LONG */